Generation of wideband linear frequency modulation signals

Details Generation of wideband linear frequency modulation signals Generation of wideband linear frequency modulation signals

1988-04-22

1994-12-20

Cain, David C.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Search sweep of oscillator

331 47, 331178, H03B 2300, H03L 706

Patent

active

053749030

ABSTRACT:
A low-frequency low bandwidth Linear Frequency Modulation (LFM) waveform, nominally a 1 MHz to 10 Mz swept frequency analog sinusoid or digital square wave, is produced by direct digital synthesis. This waveform is upconverted in frequency and expanded in bandwidth, nominally to microwave frequencies with bandwidths of nominally 160-360 MHz, in a multiplying offset phase locked loop. The phase locked loop also linearly frequency modulates a X-band carrier with the microwave frequency LFM waveform to produce an output signal suitable for Synthetic Aperture Radar. The phase locked loop induces low phase error, and may be closed around the radar transmitter to remove phase errors induced by that unit.

REFERENCES:
patent: 4160958 (1979-07-01), Mims et al.
patent: 4546328 (1985-10-01), Smith et al.

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